Thermostat plug



Patented Nov. 21, 1922.

j UNITED STATES 1,436,267 PATENT oFFlcE.

EDMUND B. LENNIG, 0F SAN FRANCISCO, CALIFORNIA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO ELECTRIC RADIATOR t ENGINEERING CO. INC., OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA.

THERMOSTAT PLUG.

Application illed August 15, 1917. Serial No. 186,344.

T o all whom t may concern? A Be it known that I, EDMUND 1 3, LENNIG., a citizen of the United States, residing in the city and county of San Francisco, tate of California, have invented Aa new and useful Thermostat Plug, of. which the following is :1J-specification. My present invention consists of a vnovel thermostatic device which i`s preferably constructed in the form of a plug in order to enable it to be readily connected with any' electrical device which is to be regulated.

' It further consists of a novel thermostat,

wherein the thermostat blade is formed by annealing together two metal bodies of different mass and alloy to form a concrete unit, and novel means are provided to mount the thermostat plate and to support the 'fixed contact which is adjustably mounted with respect to the movable contact carried by the thermostat blade.

.With the above in View; my invention, in vits broad and generic scope, consists of a thermostat plug adaptedv to be connected to a sourcev ofelectrical; energy so as'to autoniatically'control the electrical devices which are in electrical and thermal' connection with `such thermostat.

It further consists of a novel manner and means of mounting and arranging the thermostat blade and its adjuncts, so that upon` a predetermined increase in the temperature, the circuit to which the thermostat plug is connected will be open.

Other novel features of construction and advantage .will hereinafter appear in the detailed description of my invention.

For the purpose of illustrating my invention, I have shown in the accompanying drawings, a typical embodiment of it which is at present preferred by me, since this 'embodiment will give in practice satisfactory and reliable results, although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized and that my invention is notl limited to the precise arrangement and organization of these instrumentalities as herein shown and described.

Figure 1 represents a rear elevation of a thermostat plug embodying my invention.

Figure 2 represents a sectional view, taken on line 2-2 of Figure 3,

Figure 3 represents a section on line 3-3 of Figure 2. 1

Figure 4: represents a section on line 4-.4 of 'Figure 2.

Figure 5 represents a section on line 5-5 of Figure 2.

Figure 6 represents a perspective view of a thermostat plug embodying my invention.

Similar numerals of lreference indicate corresponding part'sg` Referring to the drawings 1 designates a thermostat embodying my invention, which is formed of two sections of insulating material 2 and y3, respectively, which are connected together by means of fastening devices 4 of any desired type. These vsections are chambered or hollowed out in anydesired manner in order to receive the various elements of the thermostatic control The sections of the plug when united vform an aperture 5 through which is adapted to be inserted the terminals of an electric iron or other electrical device employing a plug to electrically connect such device with a source of electric energy.

6 and? designate clips to receive the terminals of theelectric device to which the plug is to be connected. These clips may be of any desired or conventional construction, and in the form shown the members of the clips 6, for example, are mounted on a section by means `of a screw 8, which passes through t-he clips'and through a metal post 9 and Ainto the section 2;v Thepost 9 has its ends upwardly deflected, as indicated at 10,

see Figure 2. The terminal 'I is' secured in a similar manner by means of the fastening device llv-and the post 12, and the fastening device 11 also secures in position an arm 13 of angle formation, which isconnected to the base plate 14 also,K preferably of angle 'formation and se-curedin position by means of the fastening devices 15 and 16.`

Secured to or integral With the base plate 14 is a post 17 to which is secured a thermostat blade 18 by means of a Ifastening device 19. The thermostat blade18 is formed of a plurality-of metal bodies of different mass and alloy and different coefficients of eXpansion, said bodies beingyannealed together. This thermostatic blade is fixed at one end by means of thefastening device 19 and its opposite end is free and is provided with a contact 20, which normally engages the movable contact 2l which consists of a screw adjustable in a post 22 secured in any desired manner to the casing' section 2.

23 designates an electrical conductor connected with the post 22 and 24 designates the other electrical conductor which is connected With'the fastening device 8 of the clip 6. i A portion ofthe side Wall ofthe section-,3 of the plug is cut awayjwand theJ-` openingthu formed is covered by an apertured. plate 25 which is secured in' position by ymeans-of fastening devices 26 engaging the casing section 3. The chambers 27 and 28 formed bythe plug sections 2 and 3 are in communica-r tion with the atmosphere through the apertures 29, the number and location of which` may vary in accordance with requirements and conditions met with in practice. These spaces provide for an air current Vfor con- ,veying Warm air from the electric device to act upon`the thermostat blade 18.

In theV operation, the circuitis normally' closed, but when the temperature of the iron, for example, increases to the predetermined point, the thermostat blade 18, will move away from the movable contact 21 and the circuit, will bev opened.

Owing to the provision of the adjustable Contact member 2l, lthe device may be readily regulated so that the circuit'uvill be opened and will close at any desiredv degrees of tempera-ture. Y

It will be' seen that the thermostat blade is mounted on ametal stripnfso that the sud-A den changes. of temperature' Will be quickly distributed to ac't on' the thermostat blade and the insulating material ofthe plug is provided'with air passages so 'that.theproper circulation of air Within the plug is ef'- fected. '4 y# n 1t will be seen thatvone section of the lug forms a'base or support-'on which the t ermostatand its adjuncts is mounted and the` VYwhich will give'in practice satisfactory and reliable results, it is'to be understood that this embodiment is susceptible ofvmodica tion in various particulars without departing from the spirit or scope of the invention 0r sacrificing any of its advantages.

Having thus described my invention, what I claim as nevv and desire to secure by-Let- A thermostatic device of the character described, Which is adapted to open and close 4a circuit, comprising a. base Aof insulating material, a cover of insulating material forming a plug, a thermostat blade, composed oftwo metal strips of different mass and composition, an adjustable contact, said -thermostat blade being securely heldin po base, said plug having a series of air passages in its insulating material for convey- Aing changes ofair to' the thermostatblade,

and saidcover having an opening therein in v proximity to said blade, a perforated plate closing said opening, and a metal strip for conducting heat to said thermostat blade. EDMUND B. LENNG.

WTitnesses: f

Gno. Pneu,

`. Gmo. J. CoA'rEs. 

